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Article Dans Une Revue Journal of the Acoustical Society of America Année : 2021

Random versus regular square lattice experimental comparison for a subwavelength resonant metasurface

Résumé

An experimental comparison is reported here between two equivalent resonant subwavelength metasurfaces made of long aluminum beams glued closely together on a thin aluminum plate. One metasurface has a random distribution of the resonator beams, and the other has a regular square lattice of pitch 1.5 cm. The random lattice shows the “resonant” behavior of a typical metasurface, with a wide full bandgap for the first A0 Lamb mode. Instead, the regular square lattice combines Fano resonance with Bragg scattering at the edges of the passband, thus creating anisotropy and a pseudo bandgap. Comparisons with numerical simulations are performed, with good agreement with the experimental data. The multimodal response of the beams is also responsible for double negativity in a narrow frequency band, and the event of a pseudo bandgap around this same flexural resonance. In addition, the scattering regimes for both the random and regular metasurfaces are characterized using coherent and incoherent signal analysis.
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Dates et versions

hal-03996311 , version 1 (19-02-2023)

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Martin Lott, Philippe Roux. Random versus regular square lattice experimental comparison for a subwavelength resonant metasurface. Journal of the Acoustical Society of America, 2021, 149, pp.3645 - 3653. ⟨10.1121/10.0005060⟩. ⟨hal-03996311⟩
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